From 0838ce19502ab63fc9cd582ddc77904f2590b99c Mon Sep 17 00:00:00 2001
From: Alexander Drozdov <al.drozdov@gmail.com>
Date: Wed, 30 Sep 2020 17:21:08 +0300
Subject: [PATCH] fix infinite loop

ngx_http_upsync_del_delay_delete():
conn_interval shouldn't be zero. When ngx_cycle->connection_n < 30, we have to
explicitly set it to 1.
---
 src/ngx_http_upsync_module.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/ngx_http_upsync_module.c b/src/ngx_http_upsync_module.c
index b87a2f4..1d3cc6f 100644
--- a/src/ngx_http_upsync_module.c
+++ b/src/ngx_http_upsync_module.c
@@ -3286,6 +3286,9 @@ ngx_http_upsync_del_delay_delete(ngx_event_t *event)
 
     c = ngx_cycle->connections;
     conn_interval = ngx_cycle->connection_n / 30;
+    if (!conn_interval) {
+        conn_interval = 1;
+    }
     for (i = 0; i < ngx_cycle->connection_n; i += conn_interval) {
 
         if (c[i].fd == (ngx_socket_t) -1) {